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What is ERW Tubing?
Welded pipe is a type of steel pipe that differs from seamless steel pipes. This type of pipe has a weld on its surface. It is created by bending steel plates or steel strips into tubes with the desired cross-sectional shape and size and then welding the welds together using various welding techniques. Welded pipes are commonly manufactured using spiral submerged arc welding (SSAW), longitudinal submerged arc welding (LSAW), and electric resistance welding (ERW).
What is ERW Tubing?
ERW tubing, also known as electric resistance welded tubing, is a pipe created by heating the edges of metal pipes to a plastic or molten condition with resistance heat before applying pressure to butt weld the edges. ERW offers the characteristics of high production efficiency, cheap cost, and high weld quality, making it vital in machinery manufacture, the automobile industry, construction engineering, and other areas.
Process & Principle of Electric Resistance Welded Tubing
Raw materials: The raw materials of ERW tubing are generally steel coils or steel strips.
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Pretreatment: Uncoiling → Leveling → Shearing
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Forming: The processed steel strip is fed into the forming equipment, where it is gradually curled into a round or other required shape of tube blank
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Welding: The edge of the steel strip is heated to the welding temperature by resistance heating, and a strong weld is formed by extrusion force
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Heat treatment of the weld
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Cooling: Air cooling or water cooling
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Sizing: The cooled pipe is fed into the sizing equipment to ensure the dimensional accuracy of the product
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Cutting & pipe end treatment: According to customer requirements, the ERW mechanical pipe is cut into the required length and the pipe end is treated
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Factory inspection
The principle of ERW process:
When a high-frequency current passes through the contact resistance at the tubes edge, heat is generated, which quickly melts the metal to a molten condition. At the same time, the electromagnetic force generated by the high-frequency current squeezes the metal at the tubes edge together, forming a tight weld.
Advantages of ERW welding process:
⚑ No additional solder is required during welding, which saves costs.
⚑ High production efficiency.
⚑ The weld generated by the ERW technique is totally consistent with the chemical composition of the source material; the weld structure is dense, has high strength, good toughness, and can meet diverse application requirements.
⚑ The ERW welding process is appropriate for producing steel pipes of various materials and standards, such as low carbon steel and alloy steel.
⚑ The ERW welding process eliminates the need for welding supplies like welding wire or welding rod, which reduces waste and pollution emissions during welding.
Specifications of Our ERW Tubing
✔ Standard: ASTM A513
✔ Type: 1a, 1b or 2
✔ Material: Carbon steel; hot rolled or cold rolled steel
✔ Sizes:
- OD: 10-55mm
- WT: 0.4-2mm
Type 1a: A.W.H.R. →as-welded, hot-rolled steel, with mill scale→ For general purpose
Type 1b: A.W.P.O. →as-welded, hot-rolled steel, with pickled and oiled steel
Type 2: A.W.C.R. →as-welded, cold-rolled steel → For higher precision and smooth surface requirements
ERW Mechanical Tubing
Performances of Electric Resistance Welded Steel Tubing
⚑ Excellent tensile strength and yield strength
⚑ Good impact and wear resistance
⚑ Uniform wall thickness
⚑ Good durability
⚑ Good dimensional accuracy
⚑ High weld quality and good surface quality
⚑ Good machinability
ERW Steel Tubing Applications
☛ Machinery manufacturing: structural parts, transmission parts, industrial equipment
☛ Automobile industry: automobile chassis, exhaust system, body structure
☛ Construction engineering: steel structure, scaffolding, guardrail, handrail
☛ Pipeline transportation: water pipes, oil and gas pipelines, steam transportation
☛ Furniture manufacturing: metal furniture, decorative steel pipes
☛ Agricultural machinery and equipment: agricultural equipment, fences, and brackets
☛ Electricity and energy: cable protection pipes, energy pipelines
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